Photographic printing paper support

Abstract

Disclosed is a photographic printing paper comprising a raw paper which has on the emulsion side a resin coating constituted of polyethylene terephthalate or a resin blend of polyethylene terephthalate and another resin and titanium oxide grains dispersed therein and on the back side a resin coating constituted of the same polyethylene terephthalate or resin blend as used in the resin coating on the emulsion side and inorganic grains having an average grain size of from 1.5 to 12 μm.

What is claimed is: 
     
       1. A photographic printing paper support comprising a raw paper provided with resin coatings on both sides, said resin coating on the emulsion side (or the side where emulsions are to be coated) comprising a resin component consisting of polyethylene terephthalate or a resin blend of polyethylene terephthalate and a resin other than polyethylene terephthalate and titanium oxide incorporated and dispersed in the resin component, and said resin coating on the back side of the raw paper comprising the same resin component as used in the resin coating on the emulsion side and inorganic grains which have a number average grain size of from 1.5 μm to 12 μm and are incorporated in the resin component. 
     
     
       2. The photographic printing paper of claim 1, wherein the content of the inorganic grains in the resin coating on the back side is in the range of 1 to 40 parts by weight per 100 parts by weight of the polyethylene terephthalate or the resin blend. 
     
     
       3. The photographic printing paper of claim 1, wherein the inorganic grains in the resin coating on the back side have Mohs' hardness of not greater than 4. 
     
     
       4. The photographic printing paper of claim 1, wherein the inorganic grains in the resin coating on the back side are the grains of talc, kaolin, CaCO 3 , BaSO 4  and CaSO 4 . 
     
     
       5. The photographic printing paper of claim 1, wherein the resin blended with polyethylene terephthalate is a polyolefin resin. 
     
     
       6. The photographic printing paper of claim 1, wherein the resin blended with polyethylene terephthalate is a polyether resin, a urethane resin, a polycarbonate resin, a polystyrene resin or a mixture of two or more thereof. 
     
     
       7. The photographic printing paper of claim 5, wherein the blending ratio of the polyethylene terephthalate to the polyolefin resin is in the range of 99:1 to 80:20. 
     
     
       8. The photographic printing paper of claim 6, wherein the blending ratio of the polyethylene terephthalate to the resin blended therewith is in the range of 99:1 to 40:60. 
     
     
       9. The photographic printing paper of claim 1, wherein the titanium oxide in the resin coating on the emulsion side has a grain size of from 0.1 to 0.8 μm. 
     
     
       10. The photographic printing paper of claim 9, wherein the content of titanium oxide in the resin coating on the emulsion side ranges from 2 to 20 % by weight. 
     
     
       11. The photographic printing paper of claim 1, wherein the resin coatings each have a thickness of from 5 to 50 μm.